If (a+b)=5 and ab=6,find the value of a2+b2; a>b
If xa+yb=1 and x=y=2b=5, find 'a'.
Find each of the following products: (i) (x+3)(x−3) (ii) (2x+5)(2x−5) (iii) (8+x)(8−x) (iv) (7x+11y)(7x−11y) (v) (5x2+34y2)(5x2−34y2) (vi) (4x5−5y3)(4x5+5y3) (vii) (x+1x)(x−1x) (viii) (1x+1y)(1x−1y) (ix) (2a+3b)(2a−3b)